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Mark str[r]chr readonly.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98663 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2010-03-16 19:36:43 +00:00
parent b85c7100c5
commit 4446b04052
1 changed files with 10 additions and 1 deletions
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11
lib/Transforms/Scalar/SimplifyLibCalls.cpp
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@ -1400,6 +1400,15 @@ bool SimplifyLibCalls::doInitialization(Module &M) {
setOnlyReadsMemory(F);
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
} else if (Name == "strchr" ||
Name == "strrchr") {
if (FTy->getNumParams() != 2 ||
!FTy->getParamType(0)->isPointerTy() ||
!FTy->getParamType(1)->isIntegerTy())
continue;
setOnlyReadsMemory(F);
setDoesNotThrow(F);
setDoesNotCapture(F, 1);
} else if (Name == "strcpy" ||
Name == "stpcpy" ||
Name == "strcat" ||
@ -1428,7 +1437,7 @@ bool SimplifyLibCalls::doInitialization(Module &M) {
} else if (Name == "strcmp" ||
Name == "strspn" ||
Name == "strncmp" ||
Name ==" strcspn" ||
Name == "strcspn" ||
Name == "strcoll" ||
Name == "strcasecmp" ||
Name == "strncasecmp") {